Polymers grafted to a fluid and flexible membrane: Extreme sensitivity to the grafting density |
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Authors: | A Nicolas B Fourcade |
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Institution: | (1) UMR 5819, Groupe théorie, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 38054 Grenoble cedex 9, France, FR |
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Abstract: | Equilibrium phase coexistence between two chemical species implies the equality of the chemical potentials and of the osmotic
pressures. We study this problem on a deformable membrane when one type of the molecules serves as anchor for polymeric chains
immersed in the surrounding medium (considered as a good solvent). We derive the general conditions for phase coexistence
when both the curvature of the membrane and the density field of the anchor molecule are free to adjust themselves. We show
that curvature favors phase segregation. Our model predicts that membranes decorated with polymeric chains exhibit new shape
bifurcations without equivalent in fixed density systems.
Received: 26 November 2002 / Accepted: 2 April 2003 / Published online: 12 May 2003
RID="a"
ID="a"e-mail: nicolas@drfmc.ceng.cea.fr
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ID="b"e-mail: bfourcade@cea.fr |
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Keywords: | PACS 82 35 Gh Polymers on surfaces adhesion – 87 16 Dg Membranes bilayers and vesicles – 68 15 +e Liquid thin films |
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